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Method for innocent treatment and resource utilization of industry byproduct waste salt slag

A technology for harmless treatment and industrial by-products, applied in combustion methods, incinerators, lighting and heating equipment, etc. Simple and easy process, low cost effect

Active Publication Date: 2013-08-28
HUNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most difficult problem with this method is that the salt melts, rings, and agglomerates at high temperature (higher than the melting point of the salt), resulting in engineering problems such as the failure of the equipment to operate normally, and it is difficult to realize industrialization.

Method used

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  • Method for innocent treatment and resource utilization of industry byproduct waste salt slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Harmless treatment of hydrazine hydrate by-product sodium chloride waste salt residue.

[0015] The COD value of hydrazine hydrate by-product sodium chloride waste salt slag (make the salt into a 20% aqueous solution and test the COD value of the solution) is 5700ppm.

[0016] The flue gas heated to 500-700°C by the hot blast stove is passed into the pipe in the pyrolysis furnace, so that the temperature of the pyrolysis furnace is stabilized at 300-500°C, and then the dried hydrazine hydrate by-product sodium chloride waste salt slag is continuously Add the top disc of the pyrolysis furnace from the top of the pyrolysis furnace, the material moves from top to bottom, and the residence time is 4-7 hours. The tail gas from the pyrolysis furnace returns to the hot blast stove through the tail gas pipe for use, The heated flue gas coming out of the heating pipe enters the waste heat boiler to generate steam for utilization. The flue gas is discharged at high altitude after...

Embodiment 2

[0020] Harmless treatment of waste salt residue of sodium chloride by-product of glyphosate.

[0021] The COD value of the waste salt slag of sodium chloride, a by-product of glyphosate (make the salt into a 20% aqueous solution, and test the COD value of the solution) is 12000ppm.

[0022] The flue gas heated to 600-900°C by the hot blast stove is passed into the pipe in the pyrolysis furnace to stabilize the temperature of the pyrolysis furnace at 400-600°C, and then the dried glyphosate by-product sodium chloride waste salt slag Continuously add the uppermost disc of the pyrolysis furnace from the top of the pyrolysis furnace, the material moves from top to bottom, and the residence time is 4-8 hours. The tail gas from the pyrolysis furnace returns to the hot blast stove for use through the tail gas pipe. The heated flue gas coming out of the furnace heating pipe enters the waste heat boiler to generate steam for utilization. The flue gas is discharged at high altitude afte...

Embodiment 3

[0026] Harmless treatment of metalaxyl by-product sodium chloride waste salt residue.

[0027] The measured COD value of metalaxyl by-product sodium chloride waste salt slag (make the salt into a 20% aqueous solution and test the COD value of the solution) is 7800ppm.

[0028] Pass the flue gas heated to 650-1000°C by the hot blast stove into the pipe in the pyrolysis furnace to stabilize the temperature of the pyrolysis furnace at 350-600°C, and then the dried metalaxyl by-product sodium chloride waste salt slag Continuously add the uppermost disc of the pyrolysis furnace from the top of the pyrolysis furnace, the material moves from top to bottom, and the residence time is 6-10 hours. The heated flue gas coming out of the furnace heating pipe enters the waste heat boiler to generate steam for utilization. The flue gas is discharged at high altitude after being dedusted by the water film. The pyrolyzed salt is discharged from the bottom of the pyrolysis furnace and becomes a ...

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Abstract

The invention discloses a method for innocent treatment and resource utilization of industry byproduct waste salt slag. An innocent treatment system is composed of a hot air furnace, a multi-layer round disk pyrolyzing furnace which is provided with a heating device and a waste heat boiler. The waste salt slag is continuously added into the uppermost layer of round disks of the pyrolyzing furnace from the top of the pyrolyzing furnace, materials move from top to the bottom and are transferred to the bottom of the pyrolyzing furnace through the multi-layer round disks to be discharged, the heating temperature in the pyrolyzing furnace is 300-600 DEG C, the staying time of the materials is 4-10 hours, organic harmful impurities in waste salt are decomposed into volatile exhaust gas by means of heat decomposition when being heated, the exhaust gas is introduced to the hot air furnace to be calcined at a high temperature, and smoke which is heated in a mode that a heat source is recycled and reutilized through the waste heat boiler. The method for the innocent treatment and the resource utilization of the industry byproduct waste salt slag enables poisonous harmful chemical substances in the industry byproduct waste salt slag to be decomposed into the volatile gas, the chemical substances can be effectively separated from solid salt, so that the innocent treatment is achieved, secondary pollution can not be generated, the smoke generated in the hot air furnace can be recycled and utilized, salt after being processed by the innocent treatment can be used as resources such as industrial raw salt, building material additives and snow-melting agent.

Description

technical field [0001] The invention relates to a method for harmless treatment and resource utilization of industrial by-product waste salt slag, in particular to a method for harmless treatment and resource utilization of industrial by-product waste salt slag containing chemical harmful substances. Background technique [0002] In the production process of many fine chemicals, chemical pesticide products or intermediates, a large amount of by-product waste salt containing toxic and harmful chemicals is produced, such as producing 1 ton of hydrazine hydrate, which produces 4-5 tons of by-product chlorine containing toxic and harmful chemicals Sodium chloride salt slag, for every ton of glyphosate pesticide produced, 1.1-1.4 tons of by-product sodium chloride salt slag containing toxic and harmful chemicals will be produced, and formic acid and vitamin C will be produced as a by-product of sodium sulfate containing toxic and harmful chemicals Waste salt slag, the annual by-p...

Claims

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Application Information

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IPC IPC(8): F23G7/02F23G7/06
Inventor 贺周初彭爱国杨慧余长艳肖伟庄新娟刘艳
Owner HUNAN CHEM RES INST
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